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authorStefan Liebler <stli@linux.ibm.com>2021-03-31 16:17:01 +0200
committerStefan Liebler <stli@linux.ibm.com>2021-04-01 09:14:20 +0200
commit01e045117520200a1285ed112576c1be002a34d6 (patch)
tree0ae1140eb60c8977aa385909fc660cf2603b9ceb /sysdeps
parenta0bf2897ce1afb30296e7b886e344dad0c788c0f (diff)
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S390: Allow "v" constraint for long double math_opt_barrier and math_force_eval with GCC 11.
Starting with GCC 11, long double values can also be processed in vector
registers if build with -march >= z14.  Then GCC defines the
__LONG_DOUBLE_VX__ macro.

FYI: GCC commit "IBM Z: Introduce __LONG_DOUBLE_VX__ macro"
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=f47df2af313d2ce7f9149149010a142c2237beda
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/s390/fpu/math-barriers.h21
1 files changed, 19 insertions, 2 deletions
diff --git a/sysdeps/s390/fpu/math-barriers.h b/sysdeps/s390/fpu/math-barriers.h
index 68a3e55098..13fd30017f 100644
--- a/sysdeps/s390/fpu/math-barriers.h
+++ b/sysdeps/s390/fpu/math-barriers.h
@@ -21,13 +21,26 @@
 
 #ifdef HAVE_S390_VX_GCC_SUPPORT
 # define ASM_CONSTRAINT_VR "v"
+# ifdef __LONG_DOUBLE_VX__
+/* Starting with gcc 11, long double values can also be processed in vector
+   registers if build with -march >= z14.  Then GCC defines the
+   __LONG_DOUBLE_VX__ macro.  */
+#  define ASM_LONG_DOUBLE_IN_VR 1
+# else
+#  define ASM_LONG_DOUBLE_IN_VR 0
+# endif
 #else
 # define ASM_CONSTRAINT_VR
+# define ASM_LONG_DOUBLE_IN_VR 0
 #endif
 
 #define math_opt_barrier(x)						\
   ({ __typeof (x) __x = (x);						\
-    if (__builtin_types_compatible_p (__typeof (x), _Float128))		\
+    if (! ASM_LONG_DOUBLE_IN_VR						\
+	&& (__builtin_types_compatible_p (__typeof (x), _Float128)	\
+	    || __builtin_types_compatible_p (__typeof (x), long double)	\
+	    )								\
+	)								\
       __asm__ ("# math_opt_barrier_f128 %0" : "+fm" (__x));		\
     else								\
       __asm__ ("# math_opt_barrier %0"					\
@@ -35,7 +48,11 @@
     __x; })
 #define math_force_eval(x)						\
   ({ __typeof (x) __x = (x);						\
-    if (__builtin_types_compatible_p (__typeof (x), _Float128))		\
+    if (! ASM_LONG_DOUBLE_IN_VR						\
+	&& (__builtin_types_compatible_p (__typeof (x), _Float128)	\
+	    || __builtin_types_compatible_p (__typeof (x), long double) \
+	    )								\
+	)								\
       __asm__ __volatile__ ("# math_force_eval_f128 %0"			\
 			    : : "fm" (__x));				\
     else								\